1. The problem asks which sample method is least likely to produce biased results in a survey comparing the popularity of different sports at a school. 2. Bias in sampling occurs when certain groups are overrepresented or underrepresented, leading to unrepresentative results. 3. Option A interviews volunteers, which can lead to volunteer bias because only those interested may respond. 4. Option B interviews students at a football game, likely overrepresenting football fans. 5. Option C interviews students arriving at school, which is more random and less likely to favor any particular sport. 6. Option D interviews swimmers at a swim meet, overrepresenting swimmers. 7. Therefore, option C is the least biased because it samples a more general and random group of students. Final answer: C. Interview the first 50 students to arrive at school in the morning.